I'm starting to think that I don't care about my relatives.
Are you having problems with them?
They make my mom cry all the time.
You don't have to feel close to all your family members. You should ask your mom how you can support her in setting boundaries with her family members. This will let her know you care about her feeling.
OK, that's a good idea.
It's great that you're looking after your mom like that. Sometimes even parents need to know that their kids are on their side, and I'm sure that your mom appreciates you defending her from your unpleasant relatives.