The word "in's" can be challenging to find synonyms for, as it's a colloquial and informal contraction of the phrase "in his." However, possible substitutes for "in's" could include "inside of his," "within his," or "contained in his." If "in's" is used in the context of possession, alternatives could be "belonging to him," "his own," or "owned by him." To replace the contraction entirely, one could use the complete phrase "in his" or rephrase the sentence altogether. In any case, choosing precise and clear language is crucial to avoid any ambiguity or confusion in communication.
