What class has access to a familiar

[El Condoro]

Yeah, so a (1st level, or any level) variant human rogue takes Ritual Caster as his feat and then gets a hawk familiar. The hawk uses its action to Help and the rogue gets advantage on his Sneak Attacks. Nice.

An intelligent creature might ready an attack for when the familiar comes into range (AC 13 for a hawk is not too hard to kill at 1 hit point) but it will still be a good tactic.

Actually, I liked the old days (2e?) where the caster lost hit points if his familiar died. No such problem in 5e - it's not a beast, so just cast the spell/ritual again and get a new one.

[JC_Wijma]

It would appear that the only way to obtain a familiar is via the Find Familiar spell. This is a Wizard spell so the Wizard would certainly be able to get one. This spell is not on the Sorcerer's list so the answer to your question would appear to be no, the Sorcerer does not gain a familiar.

The reason why this spell is only on the Wizard spell list is because find familiar is usually cast once from a scroll. Sorcerers can also cast Wizard spells from scrolls, so they too can gain a familiar this way. In fact, ANY class that can cast this spell from a scroll could gain a familiar now, including a Rogue crass.