Hi
Here's what I can see ,not sure how much help it is.
William Harrison bapt Pershore 8.8.1541 son of Rychard Harrison
Siblings Joane or John 1542 (no date) ,William 31.12.1546,Kathetrine 6 Dec 1548 and John 18.6.1552
Maria buried April 1628 and Williand (could be William) 12.6.1617.
Elizabeth d of William Harryson bapt 5.2.1544 is the only other christening 1500-1582.
Perhaps the son William junior's children-
Elizabeth 21.12.1579 at Cropthorne -all the rest at Pershore William 15.6.1582, Lucy 5.1.1584,Lucy 15.7.1592
William Harrison married Fladbury Isabella Norris 20.1.1608 -probable children
Elizabeth 19.2.1610,Child 27.6.1614 ,Margaret 27.2.1617,Margerie 24.2.1618 ,William 9.10.1622,William 26.2.1625 ,William 23.2.1626 ,Margareta 1.3.1633 buried 4.5.1639 , Thomas 1638, William 22.4.1641, son 8.11.1641,
Elizabeth no parents bapt 30.3.1616
There is also a Will for a Ralph Harrison of Caddicroft gent 12.10.1644
Sons Raphe bapt 7.4.1622 ,John 19.9.1624,Sara 3.9.1629 and Elizabeth 14.10.1632
Early possible children at Cropthorne
Mary 25.4.1613 -30th July,Sophia 25.11.1615,Sophia 25.2.1616,and William 30.5.1619.
A star court procedding at the National Archives for 1606 states Ralph is the son of William Harrison even if I can't see a baptism.
In 1623 Ralph was broken into by a George Allen of Par.Again National archives.
That covers everything I can find 1500-1640 in the parish records.
Hope that helps
Ciderdrinker