An option to search the tree for spouses in the relationship tab

This is going to be difficult to explain, and might sound a bit queer. I am having trouble linking a person in my tree that is a sibling to another person in my tree but is married to a great uncle belonging in another location. The only way that I see to have her linked to both people is to create two profiles for her. I do not want to  add her twice so that it looks like two different people. I also have a brother in my tree that belonged to one branch with his marriage and child, but fits into another because of his brother. The relationships are such that the families ended up crossing due to marriages within the two families. I do not see an option for linking these types of scenarios. I am certain that it happens all of the time in small towns like this set is from. I hope that my explanation is clear enough for you to understand my issue.