In 1620, Thomas Cotton married Margaret Howard with whom he had his first son, Sir John Cotton, just one year later in 1621. Sir Thomas Cotton's marriage with Margaret Howard ended in 1622, which had been the year that Thomas Cotton's father, Sir Robert Cotton, permanently moved residence to The Cotton House, along with the library which remained in the Cotton House until Sir Robert Cotton's death nine years later in 1631. The relocation of the library and residence to the Cotton House gave members of Parliament and government workers better access to the matter within the library to be used as resources for their work.