Helping someone with a mortgage; implications for me as a potential first time buyer

[Shivvy]

My parents are thinking of buying a bigger property and I am considering helping them raise the mortgage (as the property is expensive). If I do this, will I still be able to get a first time buyer exemption when I go to purchase my own property. My parents do not intend to name me on the title of their new property - I would just be on the mortgage papers.

I really want to be considered as a first time buyer when I go to buy my own house. Is there any other way I can help my parents with their financing of their new home without losing my first time buyer exemption.