My wife says. I am too nice?? long story but you tell me

Forgive the errors its late but please read it and let me know.

So my wife thinks I am too nice. Most of my family stopped dealing with me after I came out. I came out at sixteen. I am now 30. I have always taken care people. I am the second children out 4 children. My mom is addicted drugs has been as long as I can remember. I was raised by granny papa n uncle. My siblings qnd I lived with my uncle. Anyway my uncle started getting sick so i had helo out more become second mom even to my older brother. I mey my dad when was 15. I discovered I had sisters and became close to my sister lets call her Mercedes and my older sister Kathy. Kathy got pregnant at 17 i with twin boys. They moved in with us my sister needed lots of help and of course i was there. I woke up every cry bottle and diaper change . I got them dress took them daycare which I paid for. I came out my sister freaked was beginning of downfall for us that abd she hated how close dad and Mercedes were to me. Mercedes got pregnant and had moment after born my nephew earnes his wings. Mercedes grew really depressed. A year later she had my niece lets call her Brittany. Mercedes kept partying dating and hanging around wring crowd. Brittany went from family member to family member. I finally adked her if i could have her i had my own place and car with my now ex. She agreed well she dating pretty messed up dude beat her . I mean worse than Ike did Tina. One day we wemt pick up some money from her he was stabbing her i threw Brittany in her neighbors house ran up him off her. My ex calls police and Mercedes says if do it ill twke Brittany this punk says yeah give me my daughter. I left with Brittany and next day I filled for guardianship it hury but had protect my niece. She was 3 at time. I won a month long month later i won even had give her back her until I did. My sister Kathy was always starting up drama when i let my niece visit her she even called cps on me 3 times and took me court loss everytime. Kathy didnt want have because Im gay.I became distant got a judge approval to keep her away from her.My sister. I still always gave money when she needed it I still watched Kathy kids too when she needed me I was there. Mercedes died last year. I tried ti build bond with my sister Kathy after all we had just lost our sister. I stupidity signed on my fb on her phone n didnt log out. I forgot about it anyway saw wad fighting with my ex (not physical) just over fb. She read message where my ex stole from me. She filled custody in secret won fed my baby lies. I had let me my niece go to stay summer. She told her i was reason that didn't have a relationship witb her mom. My niece began to believe it and when asked me i couldn't very well say no your mom wad drunk and off coke. I simply kissed told her i was so sorry things happened way they did. I left i choose not put her through more turmoil because she was my earth child even though I didnt birth her . Well now Kathy wants me baby sit the kids . I was. Thinking about but my wife doesnt trust her at all. She wont let me see Brittany or talk her without her being there.No Brittany will not be included in kids to be watched Am I too nice?..