Where does “thon” come from?

I notice there's a mismatch: the chain provided traces "that" (a demonstrative pronoun), but the headword is "thon" with unknown meaning. I cannot write an accurate etymology for "thon" using a chain for "that." Could you clarify: Should I write the etymology for "that" using the provided chain, or do you have the correct etymological chain for "thon"?

thon (English): they; them

Definitions

  1. they; them

Ancestry of “thon”, step by step

StepLanguageWordMeaning
1Englishþatso, so that, in order that
2Middle EnglishþatAlternative form of that
3Old Englishþætnominative/accusative neuter singular of se: the;...
4Proto-Germanicþatnominative/accusative singular neuter of *sa
5Proto-Indo-Europeantóddemonstrative pronoun; that; it
6Proto-Indo-Europeanto-it; that; the, that
7Proto-Indo-Europeanthis; that

Words derived from “thon

Every word from Proto-Indo-European Every word from Proto-Indo-European to-Every word from Proto-Indo-European tód