If your advice is sought on how to educate and civilize children, I say, be honest, be encouraging, and be gentle. Lead by example and do it with love.
If your advice is not sought out, mind your own business. If you cannot accept them for who they are, even if you don't like what you see, you can stop inviting them over.
If you have a close relationship with your sister, you can gently bring up topics that concern you about her children. Make sure you do so without judgment and more with observation. I noticed Billy does not clean up after himself, and that you get annoyed cleaning up after him every time. At this age, he does have the maturity and development to be able to do it himself. I heard that if you do (etc) it helps them form those habits. What do you think?
And if she says something like, oh, I don't have time to do that, drop it. If she prods you for more, offer it.
Hope that helps.
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