Linda will keep it secret for about a year. She'll attempt to tell Mick a few times but he'll be interrupted. He'll feel shes being distant which will result in him doing gestures and her looking like shes straining out a sh*t when Mick and everyone looks away.
Mick will eventually find out in a crowded vic on Xmas day. He'll pull a constipated look on his face before smashing up the dinner then Dean. ALthough he might not know it was Dean right away, they might drag that out another few months.
Shirley will offer him some advice, in her aggressive fashion, to which he'll reply "leave me alone u ain't my muvva" before shirley calls out to him "YES I AM"