I adopted a disabled child and my family is giving me a hard time about it?

I didn't have any children and I adopted a disabled daughter, she's 12, she's a quadriplegic and is ventilator dependent and has to be tube fed, diapered, is underweight and has had a hurtful past. She will always need to be cared for. My parents and siblings were shocked when i chose to adopt her even though she's a beautiful girl despite her disabilities and they have kept asking me why I didn't adopt a baby or at least a child that wasn't disabled if I was going to adopt one, or why I just didn't have my own. They've said rude things in front of my daughter (and she is perfectly mentally capable so she can understand) even though I've told them not to, and they don't talk to her much and my parents don't treat her at all like they treat my brother and sister's kids (which are their biological grandchildren and they don't have any problems)....I've always loved my family and they live near and come over to visit but how can I get them to treat my daughter better? I'm close to her already and she will cry to me about these things.