IPA: /ðɛr/
KK: /ðɛr/
Belonging to or associated with the people or things previously mentioned.
Their house is the largest on the street.
The word 'their' originates from Old English 'þeira', which is the genitive form of 'þe' (meaning 'the'). It indicates possession, meaning belonging to them.
Think of 'the' as a base word that helps you remember 'their' means something that belongs to 'them'.