Time of birth of first sis is between6&7 pm and date of birth is 19 may 1987.

Sam,
Your sister who was born on the 6th of May 1982 at 8 pm had Mercury in her 7th house of Marriage and partnership. She prefers to work in partnership rather than working on her own. She likes to socialize and she communicates well with the public. She needs to be married, so she can maintain her mental balance. Her husband should be of an intellectual type of man, who can support her and offer her mental companionship. She is suited to work in arbitration, and she can do public relation work, and counselling. At the moment, and until mid January 2019, transiting Saturn opposes her 7th House of Marriage, so she won’t get married until then. Your sister who was born on the 19th of May 1987 at 06:30 pm had Sun in her 7th House of Marriage, so she will express herself mainly through marriage, friendships and through social relationships. She wants to be somebody, and will spend a lot of energy in relationships with others. She will do well in an association, or a business partnership. She behaves in the best way, to fulfill her obligations towards her husband or towards her business partner. She also has Mercury in her seven House, so what I said about your other sister also applies to her, with the exception of timing of the opposition of transiting Saturn to her 7th House, which in her case will end earlier, to be more precise on the 10th of January 2018 (so she can get married after this date). Good luck to both of them.