Jehovah told Hosea to "Go, take yourself a wife of harlotry and children of harlotry" (Hosea 1:2; NKJV).
So Hosea went and took Gomer and she began bearing kids. Jezreel was Hosea's son. Lo-Ruhamah may or may not have been Hosea's daughter. Lo-Ammi was not Hosea's son.
Jehovah commanded a hard thing. Hosea obeyed. When you are faced with a hard commandment in your life, remember the unsung hero of the Bible and submit to the glory of Jehovah.