I have seen this tear apart families. protect your mom, your sister has already shown she is not a good person. but keep in mind your mom loves your sister no matter what and anything that happens to your sister will be felt by your mom also. I have a brother who moved in after my dad died and started draining my moms savings. I put him in my rental and I take the hit for missed rent, but my mom is shed of him and still is not worried that he is on the street alone. as long as she is still with us, he will have a home, after that it will be on his own merit

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)