Quite a mystery.

Have you considered the possibility that James Kewley b 1783 was never married to the mother of Lewis Philip b 1840 ? Might this account for the word "natural" in this extract from his will ?

"...... upon my natural son Lewis Philip Kewley Kewley now living with me ….”

If that were so, his birth would be registered under a surname (as yet unknown ) and the christian names might be Lewis /Louis Philip Kewley, which would fit with the curious name of Lewis Philip Kewley Kewley (I thought it was a typo, but the 1871 census entry seems to confirm it)

Do you think that the middle names of two of Lewis's children (Constantine and Platt) might be significant ?

If you haven't looked for monumental inscriptions yet, maybe something might come to light from them.

Donna, please would you look for MIs for these 2 burials:

KEWLEY, Lewis Philip 35 Braddan 8 Mar 1875

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KEWLEY, Louis Constantine 80 Douglas Borough Cemetery 11 Aug 1952

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Thank you.

Jean C