He became known by the courtesy title Earl of Yarmouth when his father succeeded to the marquessate of Hertford in 1870 .
He was the grandson of Sir George Seymour and great - grandson of Lord Hugh Seymour and the nephew of George Seymour and Lady Laura Seymour .
Hugh Seymour became known by the courtesy title Earl of Yarmouth when Hugh Seymour 's father succeeded to the marquessate of Hertford in 1870 .
He was the grandson of Sir George Seymour and great - grandson of Lord Hugh Seymour and the nephew of George Seymour and Lady Laura Seymour .