Straw-grabbing 101
Hebrews 4:14-16 Since then we have a great high priest who has passed through the heavens, Jesus, the Son of God, let us hold fast our confession. For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin. Let us then with confidence draw near to the throne of grace, that we may receive mercy and find grace to help in time of need.
Jesus shared fully in our humanity.
Being a sinless child being raised by an (allegedly) sinless mother in a *family* with no siblings* does NOT give Him any ability to fully identify with fallen humanity.
Put Him in a house with fallible, sinful human parents as the oldest child with a passel of siblings tormenting Him and setting Him up constantly because, no doubt, they were sick of hearing *Why can't you be more like Jesus? He always does what I tell Him without fighting.*
Can you just imagine the level of jealousy and resentment? *You never punish Jesus. He can get away with anything. You love Him more than us. He's your favorite.* etc. and then they go out and plot how to set Him up so it looks like He did something wrong and gets punished for it.
Now THAT provides challenges to remain sinless like nothing else.
There is NOTHING like living in close quarters with lots of family you didn't get to choose to bring out the best and worst in a person.
Yes, Jesus knows what it's like to have sinful parents and sibling rivalry.
And yet, was without sin.