Hello Sancho!
Never mind about Sophie, she will get used to you with time. She just isn't used to sharing her mom, lol.

Astrid, go slowly with him. Don't try to pick him up until you have been able to pet him. You can sit on the floor and get him to come next to you and pet him, but don't pick him up the first few times. And when you DO pick him up the first time, pick him up, talk to him and place him right back down. Slow steps. It is VERY hard to do, especially for folks like me with no patience and meaning no harm to the kitty, I feel sure they must know this, lol. Does he insist on going back outdoors, or do you just put him out again?