How to connect two profiles into one?

My grandfather had a wife who died very young and then he married her sister (my grandmother). I can create a profile of either a sister, or descended wife, but I do not know how to connect them so it is the same person. 

Same with another family - my great grandmothers brother married a sister of my great grandfather. So also she appears in two different places on the same tree. Is there a way to connect?  


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