OMG, the Shame !

A couple of days ago I received the worst news I've ever had !
No, nothing to do with the dreaded "C" disease this time ,,, possibly even worse ?
My great Dane of a son-in-law only went & poked his nose into our Family Tree .,., a project I started many years ago ,,, He was trying to find & add further back generations of MY family ( doesn't he have a family of his own to poke into ? )
I had listed only back to my Mum & Dad  and their Mums & Dads ,,ie, my grannys & grampas, all done via old aunties & uncles when I could sit them down for long enough & ply them with a few wee drams to keep them talking ! The Dane of course goes much deeper into old archives via the records office in Edinburgh ,,,
Anyway to cut a long story short and hopefully to then bury it deeply after that ,,, it turns out ( and there's no doubting it sadly ) that my paternal Granny, one Mary Hannah Potter was ,,, ugh, I can barely bring myself to say the word ,, ENGLISH !!  There, that's it ,, now can we forget it ?
I'm 25% bloody enemy !!  My family of course are having great fun with this news ,, Of all the people in the world it had to be ME, the Scot Nat .,., Jesus, I'll never live this down ,, In they come whistling the National Anthem, asking me to change the TV to Sky Sports Cricket ,, even bought me a bloody Union Jack hat for Christ's sake ,,,
My mate Steve ,, the Englisher I take great pleasure in beating at golf in our weekly "Auld Enemies" game also happened by for a visit when this dreadful news broke and is beside himself .,., giggling like a loon while still drinking MY booze. Hey Dougie, you could have played for the England footie team if we'd known this earlier !! Are you going to organise a street party for the Royal wedding Doug ,,,  The wife is threatening divorce !
The one burning question in my head is ,,, WHY didn't my old man tell me this ,, that his Ma was English as were the multitude of aunts, uncles & cousins this woman gave us ,,, her sisters & brothers are all bloody foreign as well !  He kept this obviously distasteful info to himself  for all his 74-years ,,
I now feel like an Alien in my own beloved Scotland .,.,
What to do ?,,
I'm away to see if my head fits the oven !