The only baptisms in West Malling for William and Frances were James Brown, John Browning in 1723 and Edward Browning in 1725, and so probably the same family.
I have noticed before that, particularly in the upper classes, the parents' names could be on the burial register.
William Browning was buried on 24th April 1748 and Frances, widow of William, on 1st February 1748/9.
James on on 5th February 1748/9 is unlikely to be their infant son, because of their ages.
If they were upper class, there might be a memorial in the church.
David
P.S. Ther is a tree which has the family of Edward, the son of William and Frances, but doesn't show the siblings -
https://www.ancestry.co.uk/family-tree/tree/32108059/family?cfpid=332003367637