i told my dad by text that i had got engaged, i phoned him to tell him i was pregnant but told my sisters by text.
We are not a very big talking family so text message was normal for us, i guess it depends on what kind of relationship you have with your parents as to how you tell them things.
If your mum would of argued then i would have done the same thing to avoid teh greif, my nan is like that (she brought me up) we hardly talk atall coz everytime we do we end up fighting, so now my dad and sisters pass on info to her, its just teh way we are.
I wouldnt feel bad, they know, thats the main thing.
x