Is it permissible to eat at a Muslim family's home if they sell alcohol in their shop, and what advice can be offered to them?

If the supermarket sells only alcohol, then their money is unlawful, and it is not permissible to eat from it. However, if it sells alcohol and other permissible items, the jurists have differed. Nevertheless, one should avoid doubtful matters and not eat from them except out of necessity. They must be advised and warned against selling alcohol.