Yes, it would very much be an extreme.....
Just throwing out some extreme/expressive language. I am good at that
The OP did get the TV back. And posted to open it up for 'discussion'.
But, that is THEFT.
If grandma/mil didn't return the TV, there might be some extreme consequences....
If I had to verbalize that possibility in order to get the TV back, and/or to get my DH/DW onboard with getting the TV back, then I might consider it.
And, yes, assuming that this woman might have a key...
My locks would already be changed.
I am sitting here wondering where the DH/DW, assuming he is in the picture, stands on all of this.
That is the real kicker....
OP said that they went to MIL's house to get the TV.... No mention of the DH/DW being there to help address the situation with their mother.