Eight individuals work across three cities: Delhi, Pune, and Hyderabad. Each city has at least two employees, with an equal number of males and female...

Eight individuals work across three cities: Delhi, Pune, and Hyderabad. Each city has at least two employees, with an equal number of males and females in each city. There are four married couples spanning two generations, and no married couple works in the same city. The designations held by these individuals, in descending order of seniority, are GM, AGM, CEO, Manager, Assistant Manager, PO, Clerk, and Sub staff. Only three people are senior to the only son of B. B does not work in Pune. E is the sister-in-law of G, who holds the most junior position. H is the son-in-law of D, who is immediately senior to A. F is married to C, and neither works in Delhi. The number of positions above the father-in-law of A equals the number of positions below A's sibling. Only C and H work in Hyderabad. Only PO and Sub staff work in Delhi. The spouse of E does not work in Delhi. G is the daughter-in-law of B, who is married to D. F is senior to H but junior to C.

Question: What is the designation of G's father?