We spent $75,000 transforming our basement into an in-law suite for my mom. Living together works for our family, and we all save money.

A couple bought a house with the wife's mother in Connecticut and spent $75,000 to renovate the basement into an in-law suite. The renovation took about two months, and the family now lives together in a 3,000-square-foot home. The arrangement made buying a house more affordable and has worked well for the family.

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