@dark0108 - can you please provide some detail on your income situation- both you are your finance separately (approx. income - really just checking if it is under or over $4300) - and your ages ? are you or your fiance a student?
Who is going to provide more than 50% of the household expenses? you and your fiance / husband OR your father in law?
are you going to live with your father in law for more than half of 2023? what about your fiance / husband?
Normally, there is no good tax advantage to filing MFS (married filing separate). 96% of married couples file MFJ (Married filing joint). That may make this whole issue a lot simpler.
giving us more information about your circumstance (ie. answering the questions I asked) will be easier to give a better response
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