A, B, C, D, E and F are members of a family, Amongst them there are lawyer, doctor, teacher, salesman, engineer and an accountant. There are two married couple in the family.
'D' who is a salesman is married to the lady teacher.
The Doctor is married to the lawyer.
'F' who is an accountant is son of 'B' and also brother of 'E'.
'C' who is lawyer is daughter-in-law of 'A'. '
E' is an unmarried engineer.
'A' is grandmother of 'F'.
What is the relation of B with D ?