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The question 'Il y a combien de personnes dans ta famille' means How many people are there in your family? In the word-by-word translation, the phrase 'il y a' means 'there are', by way of 'il' as '[he/it]', 'y' as 'there', and 'a' '[he/she/it] has'. The adverb 'combien' means 'how much, how many'. The preposition 'de' means 'from, of'. The noun 'personnes' means 'persons, people'. The preposition 'dans' means 'in'. The possessive adjective 'ta' means 'your'. And the noun 'famille' means 'family'.
Dans ma famille means "in my family" in French.
"Dans ma famille il y a..." = In my family there is... (or: there are...).
"how many are you in your class?"
Il y a combien de jours dans une semaine = "How many days are there in a week?"
How many people were born in one day.
"how many hours are there in one month?"
How many French teachers there are in the class
personnes are 'people' in French.
The question 'Combien de temps' means How long, or How much time [does it take]. In the word-by-word translation, the adverb 'combien' means 'how'. The preposition 'de' means 'from, of'. And the noun 'temps' means 'time'.
"Combien de fromages ?" : How many cheeses ?
combien means how much / how many in French.