All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.
In principle, one should not disclose bad dreams to others so that whoever hears it would not fulfill it or interpret in an undesirable manner. Abu Qataadah reported that the Prophet, sallallaahu ‘alayhi wa sallam, said: “A good vision (dream) is from Allaah and a bad dream is from the devil. He who sees something in a dream that he dislikes should blow three times on his left and seek refuge in Allaah from the evil of the devil, and it will not harm him. And he should not disclose it to anyone. And if one sees a good vision one should feel pleased but should not disclose it to anyone but one he loves.” [Muslim]
An-Nawawi commented on the Hadeeth saying, “The Prophet, sallallaahu ‘alayhi wa sallam, advised that when one sees a bad dream, he should not tell anyone about it; perhaps people would interpret it in an undesirable way based on its apparent indication. Such an undesirable interpretation may actually come true and materialize by the decree of Allaah.”
Therefore, you are advised to not share this bad dream with your mother and sisters and implore Allaah to guide them. Verily, the hearts of people are in the Hands of Allaah, the Knower of the Unseen; He turns them as He wishes.
You should never lose hope and keep advising them kindly and choose the optimal times and occasions for offering your advice. For further information, please refer to Fataawa 88876, 21794 and 92179.
It should be noted that abandoning the prayer out of denying its obligation is considered an act of disbelief according to scholarly consensus. However, if the person does not perform prayers out of laziness, the majority of scholars held that it is not considered an act of disbelief. Please refer to Fatwa 84235.
Allaah Knows best.