Blinded + casting a spell with a bonus action + Find Familiar

Here’s the setup:

  • My familiar is adjacent to a target.

  • I use my action to use my familiar’s senses. I’m now blinded and deafened.

  • I use a bonus action to cast a touch spell. My familiar uses its reaction to deliver the spell.

Normally, being blinded causes you to attack at disadvantage, but I can use my familiar’s senses.

Do I attack at disadvantage, or not?

Background reading:

Casting while blinded in D&D 5e (mentions casting while blind, but not specifically the issue of a familiar delivering a touch spell)