Mystery -
I was in the exact same situation almost 3 years ago. My 16 year old son got his 15 year girlfriend pregnant. Lots and lots of drama for both families. Fast forward more than two years later.....I have a beautiful grand-daughter that will be two years old the end of this month. She not only has two parents, but she has two sets of grand parents that have been deeply involved in her upbringing. Not to say it hasn't been a bumpy road, but I honestly think our family has gotten closer because of it.
Telling my JW mother? OMG! I was PETRIFIED! Every time one of my boys did something wrong, she would lay this guilt trip all over my head that they wouldn't have been "so bad" if they had been raised JW. (Actually, mom, they probably would have been WORSE because they would just do this stuff behind my back.) Basically, I took the chicken's way out. Since she lives 5 hours from me, I easily hid the pregnancy. Besides, there was a possibility she was going to give the baby up for adoption, so we didn't tell a whole lot of people.
A week after my grand-daughter was born, I told my mom. Her birth gave me the strength I needed to face her and by that time I was IN LOVE with my grand-daughter and didn't care who knew. Or what my mother thought. Her reaction was surprising. She said to me "you mean I'm a great grandmother now? Why didn't you tell me before?" She was very understanding and non judgemental. She sent a gift right away and is constantly asking for pictures.
Things seem bad now, but, trust me, they will get better. Just make sure you drill into your son's head that it WILL be a long time before he has another one!
GH