If your in-laws apply for the mortage, the mortgage is in their name and they're responsible for paying the bill. If you pay them in order to make the mortgage payment, you are building their equity, not yours. The only way you can switch the mortgage to your name is for you to buy the house from your in-laws.
but your brother is her husbande
Grandfather. Or his name, the same as you would any other inlaws.
No.
Outlaws are wanted...... inlaws aren't.
The relationship between the families of inlaws is similar to the relation ship with their family members. For example The relationship of my brother in law(sister's husband) and my another brother in law (wife's brother) will be simmilar to those relation ships with their brother's family.
Ask your spouse
petheriká
Answer It's no fun for either sex to have inlaws bugging you about this and that. I learned something a long time ago and while it's not polite and not pleasant, I did tell my inlaws, my own father included in this to bug out of my and my wife's life or don't bother to come knocking at our door they wouldn't be welcome. Of course it went over like lead ballon, but it worked and when they stepped out of line I was there to remind them that my business and my wife's business was ours and not theirs and they should butt out. It worked. Maybe it's time for you and your husband to take a stand and tell both of your inlaws where to get off.
No.
Inlaws.
Sounds like a wonderful Wedding Present for the new inlaws. The Phantom of the Opera in Toronto will be perfect and enjoyable.
Short answer? You don't! You let them find out about your sister on their own (and they will, eventually). Continue your regular (hopefully good) relationship with your in-laws as you do now.