My G. Grandfather x 10 was Sir Edward Somerset, 4th Earl of Worcester. He married Lady Elizabeth Hastings daugther of Francis Hastngs 2nd Earl of Huntingdon. Frances Hastings was his daughter and Elizabeth Hastings sister. Elizabeth Hastings children were Sir Thomas Somerset, Lady Katherine Somerset, Hon. Sir Charles Somerset, Sir William Somerset, Henry Somerset (Marquess of Worcester - my ancestor) and Lady Blanche Somerset. Her mother was Catherine Pole, daughter of Sir Henry Pole 1st Lord Montagu. Francis Hastings was the son of George Hastings and Anne Stafford.
Hope this answers your query.