Hi Mevis!
Perhaps you could ask your sister for more details of her recipe?
And the trade name/ brand of the binder she uses (if it is a bought one) or how she mixes it?
Other spices will depend on the type of sausage you are trying to make.
I do not know if you can get pork in Bahrain these days. If not then you need to look for beef/lamb recipes.
Regards,