It will be tough to get back what you put into it as it isn't cheap to just add a full bathroom in developed space but it won't be seen as negative value when the time comes to sell. I would expect the sale price to be higher than without the extra bathroom but not high enough to justify the cost if it were a resale decision.
It sounds as if it will be beneficial to your family while you are living there and only you can decide what sort added convenience an extra bathroom will have.
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