This is the 1749th most frequent Russian word.
домах
"Домах" is the prepositional plural form of "дом" (house/home), meaning "in the houses" or "in the homes."
In this sentence, 'домах' is used to indicate 'houses' in the prepositional plural case, showing the location 'in these houses'.
В этих домах живут счастливые семьи.
Happy families live in these houses.
Here, 'домах' is in the prepositional plural case, used after the preposition 'о' (about) to specify 'about old houses'.
Мы разговариваем о старых домах в центре города.
We are talking about old houses in the city center.
In this example, 'домах' follows the preposition 'на' (on), again in the prepositional plural, referring to 'on abandoned houses'.