Salaam o Rahmat upon you
Three relatively irrelevant questions ,
1- According to the Qur'an , will we have/meet current parents , grandparents , siblings and our spouse in the hereafter (i.e. Will our father and mother remain our parents just like now) ?
2- A newborn or an infant or a mature disabled cannot develop his/her "Self" and they cannot sin intentionally . If they decease , Where will their Self go , Paradise ?!
3- An interesting case : There are many families that their newborn decease after childbirth , will those families meet their son/daughter in a mature form in the hereafter ?