Does anyone else have family problems? My dad passed away when I was 8 and my mom and I used to be…

Does anyone else have family problems? My dad passed away when I was 8 and my mom and I used to be close as hell, like talk everyday, but not anymore. I have a brother that I have nothing to do with...by choice. I have a sister as well who used to be on drugs really bad, she's been clean about 2 years now Thankfully. But I remember those 5 or 6 years she was addicted we were 2x a week going to her apartment to bring her groceries and money, etc. Well the past couple years my mom has been totally different. My sister lives with her and is clean and working. She never came to my apartment that I lived in for 3 years, and a little over 2 years ago my husband and I bought a house literally 2 miles from my mom, but she never visits. I literally talk to her maybe once a month through text, and she went a month without seeing my son and he's only 4 months old! I'm so confused. I don't understand why I've been married for over 5 years, own my own home, am doing really well but yet she doesn't want anything to do with me. I'm sorry this post is so long I just don't understand. How could a mother do that? I could NEVER IMAGINE not wanting to be at my son's house all the time, talk to him everyday, etc. How does a mother just forget about her daughter?