Deed of settlement

Without stating the facts of the query it is not possible to form an opinion.

Ok 

my mother has just expired. She has 4 issues from 1st marriage and no issues from 2nd 

can anyone of her issues contest the settlement if my step father does a deed of settlement or gift to one step child from my mothers children from her first marriage . 
under the Christian law 

If your father has transferred his self acquired property in favor of the person he decided/desired by a registered settlement deed, this act cannot be challenged by the other dissatisfied child(dren) .

He is only the step father and has no issues with my biological mother. 

The facts posted are not clear to me.

Consult a local lawyer with relevant documents for proper appreciation of facts and professional advise.

Usually settlement will be temporary until permanent solution .so contact local advocate with that deed and take his valuable opinion before proceeding .

My step father is in the process of making his will

so I am interested in knowing which is better -

deed of settlement Or deed of gift . 

Who  is the owner of property  ,if it was your mother and she dies  intestate  you demand for  partition .

Originally posted by : Debz

My step father is in the process of making his willso I am interested in knowing which is better -deed of settlement Or deed of gift .  

The decision to execute will, deed of settlement or gift deed depends upon legal advise gathered by your "step-father" which is not your case, let him contact and consult a local lawyer if there is some truth in your post, which is prima facie hypothetical and time pass.