The words 'How are you', is informally said in French as 'comment allez-vous'.
The informal word for grandfather in French is "papy" or "papi."
tu
"ça va" is informal, but correct and very widely used by everybody in spoken French.
The English words 'I am fine, thank you' in informal French become Je vais bien merci.
'toi' is 'you' (singular and informal) in French.
Maman
"salut" is the informal greeting used in French as an equivalent of "hi".
'bonjour' or 'salut' (informal)
It's the informal "you".
T'avais...Tu avais...
You (familiar) = tu You (formal) = vous
if you mean salut then yes it means hi in french (informal, friends)