You are tasked with creating a simple family tree in Prolog and defining rules to determine various family relationships like parent, grandparent, sibling, and cousin. Here's a simplified family structure to use: $(2$pts$)$

John and Lisa are married and have two children, Alice and Bob.

Alice is married to Chris, and they have one child, Diana. Bob is married to Emma, and they have two children, George and Hannah.

a$)$ Define facts about who is the parent of whom.

b$)$ Define rules to determine the following relationships: parent$($X$,$ Y$)$: True if X is a parent of Y$.$ grandparent$($X$,$ Y$)$: True if $x$ is a grandparent of $Y.$ sibling $(x,Y)$ : True if $x$ and $Y$ are siblings $($sharing at least one parent and are not the same person$).$

cousin$($X$,$ Y$)$: True if $x$ and $Y$ are cousins $($their parents are siblings$).$