Those

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Old English thæt, nominative and accusative singular neuter of se ‘the’, of Germanic origin; related to Dutch dat and German das .

wiktionary

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From Middle English thos(“those”), alteration of thopl(“the; those”), equivalent to tho(“the; those”) +‎ -s(plural ending), partly by analogy with thes(“these”), whose final -s is original and not a plural ending. More at tho.

etymonline

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those (pron.)

c. 1300, Midlands and southern variant of Old English þas, nominative and accusative plural of þes, þeos "this" (see this). A collateral form of these, now used as the plural of that.