Would you be upset if .....?

I stayed with my dad and step mom for a few months after my son was born. I left alot of my baby stuff over there. My fiance's sister is pregnant so I told her that she could have my changing table because I didn't need it. When she went to go pick it up my dad gave her a bunch of my baby stuff. He gave her my canvas boxes, diaper genie and brand new towels and wash clothes. He also gave her my excersaucer. I feel bad for asking her for some of the stuff back. My dad didn't even ask me. I'm uming that he thought that I didn't want it. I'm upset and I'm not sure what to do.