All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
The paternal aunt and the maternal aunt are among the relatives that one is obligated to keep ties with and forbidden from severing ties with, so you should keep good ties of kinship with your paternal and maternal aunts with whatever ways possible such as visiting them and the like.
The fact that the wives of their sons or their daughters do not abide by proper Hijaab does not prevent you from visiting them, and you must lower your gaze from looking at them.
You should work to advise them in a kind and gentle manner about this matter of not wearing the Hijaab and not covering themselves properly, then if they take heed, praise be to Allah, otherwise if you fear to be tempted by them, you may keep ties with your aunts by phone or any other means of communication. The scholars mentioned that any way that is considered as a means of keeping ties of kinship in the customs of the people, then it is considered as a way of keeping ties with kinship.
Allah knows best.