Scenario from real life...

Your family moves into your dream home complete with an amazing mother-in-law suite.
Several years later, the economy tanks and the industry your husband is in damn near dies.
Things get ROUGH.
Your mother is a widow and lives in another state.
She's financially pretty well off and lonely since you are her only child.
Your husband slides into this crazy depression.
You have a lot on your plate with the kids, work, home, etc.
It is decided that your mother would sell her home and move in with you.
She does and starts paying off your major bills pretty much immediately.
She helps with the kids, stays in her suite mostly and is a joy all around. 
There is no more financial stress in your home and your husband gets his groove back, gets a new, way better job in a way better industry, and starts paying your mother back slowly but surely.
It's truly UNREAL how well everything has worked out for your family.
5 years later, your mother is still there and nobody is even the least bit concerned about her being there forever.
You're grateful and seriously in awe of her love, support and generosity.
You walk up on your husband while he's on the phone MAD.AS.FUG!
He hangs up pissed and you ask him what's wrong.
Turns out HIS mother has been talking ish about YOUR mother living there and she is mad because she feels like yall do more for your mother than for her and...where would yall put her up if she ever needed a place to go.

Yall never put your financial business out there to anybody and, to be honest, your husband's mother isn't the type he'd confide in anyway.
Besides...she couldn't help AT.ALL.
And now, her messiness is talking crap about your mother.
You good?
How would YOU handle?

~ MMingo