What do i do about this?

Ok so i always wanted a baby sis or bro and i got 2 twins brothers and a baby sister so i took a lot of care of my brothers, my sister was bron like few 3 months ago and i really love her she had a surgery i was so sad about it.i love them to death, i miss them everyday, i live with my mother they are my step brothers and sister. so i havent seen them in a month and half so far i miss them to death i cry about it a lot. my dad is always busy at work.this always happen. on friday my dad told me i might go vist them, didnt happen. today sunday he said will pick me up at 8:00 waited didnot happen he called said at 10:00 didnt happen he called again said 11:00 i said no i got sad and cryed so badly because i miss my brothers and sister if i had to choose between anything i would always pick them, so i called after i cryed because he said 2m monday i caan go to them, i said no i donot wanna see them.he will said he will call me 2m because he though my mom is making me say that and it wasnt. i honestly get sad really quickly. i take everything on myself.