HiCustomer Thank you for asking your question on Just Answer. By the way, it would help me to know:
-Does your daughter fault these men in front of the daughter like kissing them, hugging them?
-Does the granddaughter exhibit signs of inappropiate things?-Could you explain your situation a little more?Thank you again for trusting me with your problem. Please reply as soon as possible so that I can finish answering your question.
Since the granddaughter does not exhibit any problems with this then there really isn't anything you can do but continue to try to talk to the daughter and get her to realize what she does and how she carries herself is teaching her daughter how to carry herself also. Although the daughter is of age she is still young yet and is still learning, hopefully she is outgrowing this stage in her life. If the granddaughter seems happy and doesn't exhibit signs that the way the mother is acting affects her then I wouldn't worry about it too much but what I would worry about and keep an eye on are the men watching your granddaughter alone! Especially if they are strangers to her you don't really know if you can trust them not to harm her in anyway and nowadays you REALLY have to worry about that stuff with the growing number of pedophile out there preying on little children.
I just think that your granddaughter is too young to learn anything from what her mother does but you have to work on getting the mother to realize that the daughter will get older and start noticing things about the men coming in and out of her life. You mentioned that the daughter isn't biologically yours right, and that her real father left her mother when she was two? I really think your daughter is just afraid of being alone and always needs someone there to feel that void partly because of her father not being there and this too may be why she is drawn to losers because subconsciously she wants to change them like they are her father or she may not have much self worth even though she is gorgeous she wasn't accepted by the only man that matters her father so she may have some insecurities about that also. She really needs to work on herself before she can have a healthy relationship; she has to feel she is worth more than she has been choosing. Please let me know if I read your answer right about her biological father leaving her mother 20 years ago. Also I have included some self help books that maybe you could share with her to build her self confidence and help her to make better choices.