We bought a house with my mom and spent $75,000 to renovate her in-law suite. It saves us all money.Taylor Rains/Business InsiderMy husband and I bought a house with my mom and renovated the basement as an in-law suite.The $75,000 project took about two months, and my mom is thrilled with the results.Living together is easier than expected, and it made buying a house in Connecticut more affordable.I never thought I'd live with my mom again.But i…