The text says that he married Sarah (as his first wife) in 1200 or after, but cites a source implying they were married by 1200. Cawley goes on to say that they had 6 children and that William married his second wife by 1210.
# first wife married 1193: Sarah Fitzhugh (aka. Sarah filia Roberti) (b.1155-1160 d.c.1204)
* 1. Richard (b.c.1190-1194 d.c.1244-1249); married to unknown wife; father of John I Comyn, Lord of Badenoch (b.c.1220 d.c.1277)
* 2. Jardine Comyn, Lord of Inverallochy (b. during or before 1190)
* 3. Walter, Lord of Badenoch (b.1190 d.c.1258) married Isabella, Countess of Menteith
* 4. Johanna (aka. Jean) (b.c.1198 d.c.1274); married c.1220: Uilleam I, Earl of Ross (aka. William de Ross) (b.c.1194-1214 d.1274)
* 5. John Comyn, jure uxoris Earl of Angus (d.1242); married (c.1242); Matilda, Countess of Angus (aka. Maud) (b.c.1222, d.1261)
* 6. David Comyn, Lord of Kilbride (d.1247); married Isabel de Valoigne (d.1253)
