diff --git a/doc/api/dgram.md b/doc/api/dgram.md
index f9e9b6b87453dc..185c5f60e9a07d 100644
--- a/doc/api/dgram.md
+++ b/doc/api/dgram.md
@@ -113,6 +113,10 @@ exist and calls such as `socket.address()` and `socket.setTTL()` will fail.
 
 <!-- YAML
 added: v0.1.99
+changes:
+  - version: v18.0.0
+    pr-url: https://github.com/nodejs/node/pull/41431
+    description: The `family` property now returns a number instead of a string.
 -->
 
 The `'message'` event is emitted when a new datagram is available on a socket.
@@ -121,7 +125,7 @@ The event handler function is passed two arguments: `msg` and `rinfo`.
 * `msg` {Buffer} The message.
 * `rinfo` {Object} Remote address information.
   * `address` {string} The sender address.
-  * `family` {string} The address family (`'IPv4'` or `'IPv6'`).
+  * `family` {number} The address family (`4` for IPv4 or `6` for IPv6).
   * `port` {number} The sender port.
   * `size` {number} The message size.
 
diff --git a/doc/api/net.md b/doc/api/net.md
index 9bf34d55086992..39d7cbdac53a19 100644
--- a/doc/api/net.md
+++ b/doc/api/net.md
@@ -285,6 +285,10 @@ Emitted when the server has been bound after calling [`server.listen()`][].
 
 <!-- YAML
 added: v0.1.90
+changes:
+  - version: v18.0.0
+    pr-url: https://github.com/nodejs/node/pull/41431
+    description: The `family` property now returns a number instead of a string.
 -->
 
 * Returns: {Object|string|null}
@@ -292,7 +296,7 @@ added: v0.1.90
 Returns the bound `address`, the address `family` name, and `port` of the server
 as reported by the operating system if listening on an IP socket
 (useful to find which port was assigned when getting an OS-assigned address):
-`{ port: 12346, family: 'IPv4', address: '127.0.0.1' }`.
+`{ port: 12346, family: 4, address: '127.0.0.1' }`.
 
 For a server listening on a pipe or Unix domain socket, the name is returned
 as a string.
@@ -710,7 +714,7 @@ Not applicable to Unix sockets.
 
 * `err` {Error|null} The error object. See [`dns.lookup()`][].
 * `address` {string} The IP address.
-* `family` {string|null} The address type. See [`dns.lookup()`][].
+* `family` {number|null} The address type. See [`dns.lookup()`][].
 * `host` {string} The host name.
 
 ### Event: `'ready'`
@@ -738,13 +742,17 @@ See also: [`socket.setTimeout()`][].
 
 <!-- YAML
 added: v0.1.90
+changes:
+  - version: v18.0.0
+    pr-url: https://github.com/nodejs/node/pull/41431
+    description: The `family` property now returns a number instead of a string.
 -->
 
 * Returns: {Object}
 
 Returns the bound `address`, the address `family` name and `port` of the
 socket as reported by the operating system:
-`{ port: 12346, family: 'IPv4', address: '127.0.0.1' }`
+`{ port: 12346, family: 4, address: '127.0.0.1' }`
 
 ### `socket.bufferSize`
 
diff --git a/doc/api/os.md b/doc/api/os.md
index d0bef604d96053..ad4d082d94dc0f 100644
--- a/doc/api/os.md
+++ b/doc/api/os.md
@@ -224,6 +224,10 @@ always `[0, 0, 0]`.
 
 <!-- YAML
 added: v0.6.0
+changes:
+  - version: v18.0.0
+    pr-url: https://github.com/nodejs/node/pull/41431
+    description: The `family` property now returns a number instead of a string.
 -->
 
 * Returns: {Object}
@@ -238,12 +242,12 @@ The properties available on the assigned network address object include:
 
 * `address` {string} The assigned IPv4 or IPv6 address
 * `netmask` {string} The IPv4 or IPv6 network mask
-* `family` {string} Either `IPv4` or `IPv6`
+* `family` {number} Either `4` (for IPv4) or `6` (for IPv6)
 * `mac` {string} The MAC address of the network interface
 * `internal` {boolean} `true` if the network interface is a loopback or
   similar interface that is not remotely accessible; otherwise `false`
 * `scopeid` {number} The numeric IPv6 scope ID (only specified when `family`
-  is `IPv6`)
+  is `6`)
 * `cidr` {string} The assigned IPv4 or IPv6 address with the routing prefix
   in CIDR notation. If the `netmask` is invalid, this property is set
   to `null`.
@@ -256,7 +260,7 @@ The properties available on the assigned network address object include:
     {
       address: '127.0.0.1',
       netmask: '255.0.0.0',
-      family: 'IPv4',
+      family: 4,
       mac: '00:00:00:00:00:00',
       internal: true,
       cidr: '127.0.0.1/8'
@@ -264,7 +268,7 @@ The properties available on the assigned network address object include:
     {
       address: '::1',
       netmask: 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
-      family: 'IPv6',
+      family: 6,
       mac: '00:00:00:00:00:00',
       scopeid: 0,
       internal: true,
@@ -275,7 +279,7 @@ The properties available on the assigned network address object include:
     {
       address: '192.168.1.108',
       netmask: '255.255.255.0',
-      family: 'IPv4',
+      family: 4,
       mac: '01:02:03:0a:0b:0c',
       internal: false,
       cidr: '192.168.1.108/24'
@@ -283,7 +287,7 @@ The properties available on the assigned network address object include:
     {
       address: 'fe80::a00:27ff:fe4e:66a1',
       netmask: 'ffff:ffff:ffff:ffff::',
-      family: 'IPv6',
+      family: 6,
       mac: '01:02:03:0a:0b:0c',
       scopeid: 1,
       internal: false,
diff --git a/doc/api/tls.md b/doc/api/tls.md
index 52e0e71f1e03ab..5c91de3fd935d2 100644
--- a/doc/api/tls.md
+++ b/doc/api/tls.md
@@ -955,13 +955,17 @@ tlsSocket.once('session', (session) => {
 
 <!-- YAML
 added: v0.11.4
+changes:
+  - version: v18.0.0
+    pr-url: https://github.com/nodejs/node/pull/41431
+    description: The `family` property now returns a number instead of a string.
 -->
 
 * Returns: {Object}
 
 Returns the bound `address`, the address `family` name, and `port` of the
 underlying socket as reported by the operating system:
-`{ port: 12346, family: 'IPv4', address: '127.0.0.1' }`.
+`{ port: 12346, family: 4, address: '127.0.0.1' }`.
 
 ### `tlsSocket.authorizationError`