It sounds as if some of the information came from "Providence, Ye Lost Towne at Severn in MaryLand," by Jas. E. MOSS, 1976. You need to read this for yourself to see whether you think it's credible. It has some documentation and maps.
Mathew HOWARD was definitely of Upper Norfolk Co. (now Nansemond), VA, in 1640: Simon Peeter, 26, stated that Edy HANKING had said that Mathew HOWARD'S wife went walking with Edward LLOIDE and left the children crying...Eady HANKING shall openly ask forgiveness...and defray the charges of the court, 6 July 1640.
In 1648, Mathew was executor, and he and his six children, Samuel, John, Cornelius, Mathew, Elizabeth, & Anne, were heirs of Richard HALL, merchant, of Virginia.
MOSS says Mathew died the first week of Sept. 1659, AA, MD, but it may have been 1658.
Harry Wright NEWMAN's Anne Arundel Gentry, II, 1971, has about 150 pages about the Mathew HOWARD family. NEWMAN says that on 3 July 1650, the Surveyor General laid out for Mathew HOWARD 650 acres on the south side of the Severn near Marshes Creek, AA Co., MD. Edward LLOYD was guardian of the youngest son Philip HOWARD, & had "Howardstone" on the Severn surveyed for Philip in 1659, stating that Philip was orphan of Mathew.
NEWMAN's To MD from Overseas, 1982, gave parents of Mathew HOWARD who d. ca. 1658 in AA Co. as Philip HOWARD & Joan MARRIOTT. MOSS showed that Philip was bpt. 21 Dec. 1585, Kenninghall, Norfolk. Joan MARRIOTT was of Eye, Suffolk. Philip was a brother of the John that m. Eliz. LOCK and they were sons of Robert HOWARD & Philippa BUXTON of Tibenham Parish, Norfolk.
Actually, if MOSS is correct, the line is from Robert HOWARD, b. Jan. 1537, Syon House, London, only son of Thomas HOWARD and Princess Margaret DOUGLAS, daughter of Queen Margaret of Scotland, who was daughter of Henry VII of England. Both Ann BOLEYN & Catherine HOWARD, wives of Henry VIII, were descendants of the HOWARD family of Norfolk.
There is a will for Samuel HOWARD, made 28 F 1702, pr. 9 Nov. 1703. To wf. Catherine, dwelling plantation & "Brushy Neck" during widowhood, then to son Philip, who was also to receive the pl. where he lived & 120 acres adj. To grandch. John, Samuel, & Eliza. MACUBBIN; to cousins John, Cornelius, & Joseph HOWARD, Eliza. NORWOOD, Sarah BRICE, Hannah & John (Jr.) HAMMOND. Residue to three ch. Philip (ex.), Susan, and Ruth. Trustees, cousins John HOWARD & John HAMMOND, Jr. Wit. Jno. HOWARD, Andrew WELLSLEY, Geo. SLOCIUM. [Those listed as cousins were probably nephews and nieces.]
Catherine can be identified by the will of her father James WARNER, made 13 Feb., pr. 25 May 1673. To wf. Eliza., exx., for life, then to dau. Johanna SEWELL. Codicil, to sons Samuel HOWARD, Philip WARNER, & Henry SEWELL. Wit. Abraham CHILD, John JACOB [Wills are from MD Calendar of Wills].
Eliza was not the mother of the WARNER children. Land and Quaker records show that the mother was Anne, and Elizabeth was the widow of Wm. HARRIS.