Is it possible to pray to a certain soul in purgatory? Like my father who died two years ago? You know for them to pray for me during these hard times?
First, you cannot be certain that your dad’s soul is in Purgatory right now. Absent a private revelation from God, you don’t know where your dad’s soul is exactly; we don’t get information on that.
Second, we don’t typically pray TO souls in Purgatory because theological opinion is divided on whether they can pray for us/ intercede for us while they are there, and the Church has not said anything definitive on that. So we generally pray FOR souls in Purgatory with the understanding that when they reach Heaven, they can and will pray for us, and that furthermore if they can somehow pray for us from Purgatory, they will do that too.
Third, you may privately pray to (as in, ask the intercession of, ask them to pray for you and your intention) any soul that you reasonably believe is in Heaven. If your dad lived a generally good life and you have also prayed sincerely for his soul, then you can reasonably believe he is in Heaven and pray to him. Also, remember that Purgatory and Heaven are outside earthly time, so even if your dad is not yet in Heaven but is still in Purgatory (which you have no way of knowing) you can still ask him for his prayers, and he will pray for you when he is able (which may be now or may be after he gets to Heaven), and God will then apply the prayers at the right time which could be right now for you even if your dad ends up making the prayers in 10 or 10000 earthly time years etc.
I pray to my deceased parents, husband and other family members all the time.
I hope this helps.