Announce Pregnancy to distant dad

My dad and I have had a pretty rocky relationship . Almost every conversation ends in yelling or someone crying. 
I told him last time we talked that if he wanted to ever meet his grand kids (this was before my first miscarriage) that he needed to change his act 
That being said, now being far enough along to announce pregnancy , should I tell him or just let him find out through the grapevine ?

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