Yes, Mary and Joseph had other children.
The Lord Jesus of course does not have an earthly father. His Father is God.
But The Lord Jesus was not an only child.
Mary And Joseph's children include: James, Joses, Simon Jude, and an unnamed sister according to the Gospels of Mark and Matthew.
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Jesus' Brothers - John 7
After these things Jesus walked in Galilee; for He did not want to walk in Judea, because the [a]Jews sought to kill Him. 2 Now the Jews’ Feast of Tabernacles was at hand. 3 His brothers therefore said to Him, “Depart from here and go into Judea, that Your disciples also may see the works that You are doing. 4 For no one does anything in secret while he himself seeks to be known openly. If You do these things, show Yourself to the world.” 5 For even His brothers did not believe in Him.
6 Then Jesus said to them, “My time has not yet come, but your time is always ready. 7 The world cannot hate you, but it hates Me because I testify of it that its works are evil. 8 You go up to this feast. I am not [b]yet going up to this feast, for My time has not yet fully come.” 9 When He had said these things to them, He remained in Galilee.