Is it obligatory for the questioner to slaughter an 'aqiqah for her deceased siblings who passed away in childhood, based on her father's will, and is it permissible for her to slaughter the 'aqiqah for her children now consecutively, given that she did not slaughter it for them previously?

"The 'Aqiqah (definition) is a confirmed Sunnah (definition) according to the majority of scholars. For those who were unable to perform it in the early days of the newborn, they may do so whenever it becomes easy for them. Fulfilling a father's will after his death is a form of righteousness towards him. Therefore, there is no harm in slaughtering the 'Aqiqah for your deceased siblings who passed away in their childhood, in fulfillment of your father's will, and for your children for whom you have not yet performed the 'Aqiqah. Each 'Aqiqah can be slaughtered on a separate day, consecutively or not, or all of them on a single day."