My Parents!!!!

Someone wise once told me that you can't pick your parents.How does one overcome ones parents.For me growing up I didn't have the normal two parent home,i had four.My Dad left my mom just two weeks before my 13th birthday.It wasn't till that summer that the truth came out and it had devasting effects.The trust i had for someone who was my bestfriend was shattered.I have forgiven but i can't and oh i wish i could.I went to live with my Dad when i was 16 due to certain circumstances only to be asked to move out when i was 17 and pregnant.I pretty much have been alone without my parents that is. I was 15 when my brother and sister were born they are not twins but are 27 days apaart.I was 21 when my baby sister was born.As I have gotten older i have realized that my parents only did the best that they could for they were young when they had me.With my Dad realizing this doesn't help with the void i feel and i'm left with why don't you love me? Why haven't you been there?Why don't you want to know your grandchildren? All these questions come by honestly as my Dad is sick!I'm left to wonder if I will ever get the answers to the questions I'm asking.When can i come home and see you?
With my mom i know that her life has been anything but easy!She works fulltime and takes care of my brother who is terminally ill,and at the end of the day doesn't have much time for anything else.I know that when i went to move in with my dad i hurt her.It is something she never forgave me for and it shows in our relationship for she wasn't there either.She wasn't there when my children were born and has missed out on so much. I have questions for her to. Is why didn't you love me unconditionally like a mom is suppossed to? Why weren't you there?Why did it take me moving back for us to build our bond?However with my mom we now live in the same town again and we are slowly reparing our realionship.
My dad is doing as good as he can.I pray everyday for his forgiveness and not a day goes by that i don't think of him.My mom has me worried I only pray that right now she is overwhelmed and is forgetting things and buying as a cause of that and not somewthing more swerious.I feel that at the present time I am losing both my parents and brother all at the same time.