Inheritance

Q: Recently in my backyard I built a small cottage for my elderly parents to move into. My father actually built it i.e. he paid for it and alhamdullilah they moved in. So the main house belongs to me as well as the land, only the back cottage belongs to my father. 

I have a 20 yr old son, who my father told him that when we are gone (i.e. my parents), this house (back cottage) is yours. 

Now what happens when my parents leave this world? How does it work with regards to the inheritance etc.? 

And can it lead to problems and what will be the solution? Because my parents will obviously have to live there until they leave this world. 

Q: I purchased a house and, during my lifetime, gifted it to my son. I completed the gift (Hibah), and full possession and ownership of the property were transferred to my son, with the property registered in his name. 

My question is: After my death, will this house still be considered part of my estate tarikah) and subject to Islamic inheritance laws, or will it remain my son's sole property since I gifted it to him during my lifetime?

Q: If a person was manipulated/threatened into giving their inheritance away, and it was signed off already but based on the above can the person have a claim to it still? 

The estate has not been settled and is still in process.

Q: In order to find the properties which my deceased father owned, we need to conduct a deed search. Should the fee for the deed search be shared equally between all the heirs (i.e. the two sons and two daughters) or should the fee be shared between the heirs according to their stipulated shares of inheritance (i.e. the sons will pay double the amount the daughters pay)?

Q: With regard to Islamic inheritance, we are 3 sisters and 2 brothers and my mother. 

My father wants to add his sister (my aunty) as an inheritor. Can she inherit? 

How can this be done after he dies according to Islamic law (shariah)?

Q: I do not have cash on hand, but I wish and request my heirs and executors of my estate to continue with my donations and qurbaanies after my demise. 

Presently I receive income from different sources. Some quarterly/ some bi- annually/ some annually. 

The main income will begin after my demise. I will Insha Allah receive a monthly income for the next ten years (i.e. 120 months). 

I make a bequest of just ten percent of my gross income to charities and qurbaanies etc. 

After my demise, whenever any money is received, ten percent is to be separated and accumulated and then distributed, mainly in Ramadhaan, Eidul Adha, and whenever funds permit (mainly to building projects/extensions/renovations etc. of mosques/madressas etc. Surplus funds can also be distributed to needy family members, religious institutes etc. as per executors discretion. Is this okay?