Summarize this article in one sentence.
If you live with your mother-in-law, establish some ground rules for living together. If you know there are things that might cause conflict, talk about them beforehand and make sure everyone understands the rules and why they are in place.  For example, tell your mother-in-law that the children do not eat sugar past a certain time and that she is not to give them any before bed. Set the ground rules with your spouse and present them to your mother-in-law together. If it is your mother-in-law's house, respect her rules and authority in her home. If the home belongs to you and your spouse, make sure she understands how you like to run your home. Both you and your mother-in-law may enjoying having your own space and ways of doing things. Ask your mother-in-law how you might make her comfortable in the home while enforcing your own needs and desires. As long as your boundaries don't conflict, try to respect her space and independence.For example, your mother-in-law may be comfortable helping pay for groceries, but she may not want to hand over control of her money. Respect this request by establishing ahead of time what she can contribute monthly to the household budget. Look for the good things about her, not just the bad. If she’s always cleaning despite you telling her not to, thank her for her care and contribution. Find the positive ways she adds to your life, your partner’s life, and even your kids’ lives. If possible, do this in her presence and be genuine. If she buys you and your family things, say, “Thank you, that was thoughtful of you.” If you’re in conflict with your mother-in-law and it’s not resolving over time or on its own, it’s time to talk about it. If she tends to criticize your marriage or your parenting, let her know how this makes you feel. Be kind and honest and tell her what you’d like instead. Aim to find resolutions to your problems.  Do your best not to accuse her or blame her. Instead, share how you feel using “I” statements. For example, say, “I feel undermined when you say in front of my spouse and kids that I’m not a good parent. Even if we disagree, please respect my parenting.” You can get your spouse involved to provide a different perspective. They can also talk to her on your behalf.

Summary:
Create some ground rules. Create mutually-agreed boundaries. Look for the good she does and praise it. Talk about how she makes you feel.