A challenging riddle 4 u, let me C how many answeres? give a star if u like dis 1?

A king and his son were following the footsteps of two women and with a mutual agreement they agreed that the king will accept the lady with bigger footprint and his son will accept lady who has smaller foot print. After some search they found them out. Both of the ladies accepted the marriage proposal. The lady with the bigger footprint was the daughter of the lady whose footprint was smaller. As per the agreement King married the daughter and son married the mother. Both couples got one son each. How they relate each other? For eg: - brother, half brother, uncle etc.. only one should be allowed and it should show all relationship between them i.e. you can’t say “half brother and uncle”!!!