So upset

So, I am the oldest of 8 kids. My sister had a baby at 19 and my mom got so upset she fell pregnant 3 months after her granddaughter was born. I am now 13 weeks pregnant and my mother and father are not interested at all in their grandchild. My mother is in fact trying to have another baby now... She is almost 50 years old. I have a 2 year old brother and am almost 25. Don't get me wrong I love having a huge family, but my mother had been told by doctors to stop. Her health could be seriously compromised. I am very sad that my family doesn't even seem to care and now she is trying to have a baby because my husband and I are having our first. Ugh I don't even know what to think.