Thanks for your resonse everyone. My sister and children and mom love me even though I never wanted to get interested in their religion.
Probably my first instict, when my mom said she would follow them, was that she would distance herself away from me, but it wont be so, just like my sister and chldren and brother in law were always very happy to see me and treated me like one of them. On the contrary, I avoided them throughout the years since they just came to visit when they were celebrating birthdays, new years, christmas, easter and so on. I didn't get to know my sister's kids too much as they grew because of what the JW's taught me, and I avoided being with them in these occasions.
I was well placed to compare the JW's with my sister's religion.
In her religion, they have genuine love for one another, and accept that they are sinners, and working to better themselves.
In the JW's, they have conditional love only, and don't tolerate imperfection.