Joan Harris (Percy) - Is there proof of ten children?

I noticed that as well but then I noticed that they say plus 4 or 5 more and if you click on the and more it will list the rest of the family.

Joan Harris (Percy) MP
Place of Burial: St Mary's Parish Church, Prittlewell, Essex, England, United Kingdom
Birth: circa 1470
Alnwick Castle, Alnwick, Northumberland, England
Death: July 10, 1547 (77)
Southminster, Essex, England
Immediate Family:

Daughter of Henry Percy, 4th Earl of Northumberland and Maud Herbert, Countess of Northumberland
Wife of John Harris and Arthur Harris of Prittlewell
Mother of William Harris, High Sheriff of Essex; Alice Percy Harris; Arthur Percy Harris, Jr and John Percy Harris
Sister of Eleanor Percy, Duchess of Buckingham; Henry Percy, 5th Earl of Northumberland; Josceline Percy; Sir William Percy; Lady Anne Percy, Countess of Arundel and 4 others
Added by: Joseph David Talley on May 9, 2008
Managed by: Joseph David Talley and 52 others
Curated by: Jenna, Volunteer Curator
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This source shows a different connection to the Percy family: Lord Egremont 1st Thomas Percy.

http://genforum.genealogy.com/percy/messages/341.html