Sentence:  The legitimacy and inheritance rights of children were questionable, because colonial law did not acknowledge the validity of an <WSD>outside</WSD> marriage contracted after a monogamous, Christian one. 
Meaning of the word marked with <WSD> tags:  Not legally married to or related to (e.g. not born in wedlock to), and/or not residing with, a specified other person (parent, child, or partner);  existing between two such people. (out of wedlock), (nonresidential).