Feeling awful to see a mummy having 4 daughters not excited about the pregnancy of their 2nd daughter

if it was something about 1st daughter I'm sure how she would have posted a video with multiple sentimental dialogues, 2nd daughter is pregnant and she don't even seems to care,like it's her first grand child , how a mother can be like that , I've decided if i have children in future i won't be partial in any kind and make trauma to them causing them to be so selfish like her or something . No wonder she got married to a simple family with a simple mother in law ,but i think because of years of no so much of display of affection from her own mother she's not able to take it . Hope we all see this and learn a lesson ,how we should treat all the kids equally from when they're kids. It's visible it wasn't the case since they were a child it's deeply imprinted in evrything the second child does. She pampers all other kids except her 1st because- obviously she was first one ,3rd because she's also kid with no much age difference from the fourth one ,fourth one is ofcourse the baby of the home even after she's going to become an aunt ,not that they should take caring of her or something but it's really awful to watch this discrimination and i really think 2nd child turnes out how she's because of this ,Hope they treat her better and she also turn a better mom and grow her kid with all the love and care ,let all heal their traumas .