Am Dating My Dad's Girlfriend.

Dear Eve,
I met my girlfriend at a wedding reception.she was the chief bride's maid.i fell in love with immediately I saw her little did I know that I was aimed at doom.
I approached her and we became item immediately and was so much in love.she is a banker with a prominent bank in Nigeria while I'm a hotelier.Nothing matters to us after our first date if not our love.we spend weekends together and she became pregnant after seven months of meeting.i was so happy,I can't wait to be a father.I proposed immediately and she accepted.
The worst thing of my life happened when I went to my parents house to tell my Dad about the proposal on getting to the house I met my Dad absent.my mum was crying profusely.when I inquired what the problem was she narrated how my Dad has been cheating with a little girl and she decided to keep quiet,but as she was with Dad's phone this evening a message entered the phone.the sender told my Dad that everything seems ok now that the boyfriend  has accepted the pregnancy but she is feeling guilty since she knows very well that the pregnancy belongs to him my father and not her boyfriend.
I made nothing out of it until my mother gave me the girls number.i dailed it with true caller only for my fiancé' details to appear.i lost it,I confronted her on getting to the house,she started crying and confessing when I showed her my Dad's picture.She said that my Father had been the one footing her bills.That my Dad saw her through her university level and got her the job through his friend.
It has been two years this happened.My Dad died last Friday,he was sick for two weeks and I didn't visit him because I wanted to punish him.i didn't know he will die.i don't know what to do know since the child he had with my ex will be brought home for the burial and I don't want to see that child or my ex.i don't want my mother to see two of them too.should I avoid going to the burial or not,how do I see that child as my brother or I and my sibling stay in this life accepting him as our own??that girl destroyed my home,she ripped my mother's heart apart.
Please what should I do?
Ben Oyelowo.

Dear Ben,
you have to forgive and move ahead.That is what you should have done before your Dad died.
That child is your step brother no matter the circumstances that surrounded his birth.he is an innocent child that doesn't know anything that might have happened between your Father,his mother or yourself.just let it go.your family should embrace that little boy and give your Dad a befitting burial and support that child as far as you can.bring him close and forget your Dad's mistake.
                Over to you readers,what do you think Ben should do.