65 yr old healthy mother-in-law wants to move in with us..advice pls!

Just as the title reads..

Healthy, sane, active, financially stable with her own nice house 65 yr old mother-in-law wants to move in with 35yr old son and daughter-in-law.

Is this normal glp?!

She lives alone in her own large house, all paid for, own circle of friends she's known for over 20yrs, has her health, own car, is fit and active, involved in several groups etc, has a good life...

Yet now she's 'retired' she's bored and can't think of anything to do, so she's decided she wants to live with us and be in another country, no friends here at all, in the wilderness, a lifestyle she has no skills for at all and no interest in.

We have no space here for another person, working long hours so the hours we do get to spend time together are precious.
We don't share the same interests as her due to the generation gap mainly.


She's even taken up small part-time jobs to be doing something.

We suggest everything she's interested in to be doing but she's not interested in making the effort.
She doesn't even do anything when she does visit, doesn't make breakfast, dinner etc, doesn't clean-up or do the dishes, no feeding of animals or helping with any chores - she sits there and does nothing but talk and philosophise about life while we be her perpetual audience.

She'd give up all of her comfort, life-time friends and favourite places in her home town to be with her son and his girlfriend so she's not bored.

It feels like she's wanting to now life her life through ours...and of course get looked after in the process.
We give up our youth, privacy, space, and life goals to accomodate her retirement boredom.

When in a situation it's hard to see it subjectively - mother-in-laws especially have that effect on a relationship - i could do with some balanced advice.

Thanks!