Would spells that modify your attack bonus, such as Bless also apply to Spiritual Weapon or Bigby's hand?

Question

Would a spell or ability that affects a characters attack roll bonus be applied to spells that also make 'melee' attacks such as Spiritual Weapon or Bigby's Hand?

As per the Bless spell:

You bless up to three creatures of your choice within range. Whenever a target makes an attack roll or a saving throw before the spell ends, the target can roll a d4 and add the number rolled to the attack roll or saving throw.

So as per Bless, you are targeting the creature, the creature then casts a spell that creates a magical object that also has the ability to make an attack roll. Would Bless transfer to the spell object?

I see an argument of Yes as since you are targeting the creature and the creature is the one summoning the spectral weapon as per Spiritual Weapon or Translucent Hand, which they then control, Bless should still apply.

Answer 1

It depends on the spell. For the two spells you have as examples, we have yes and maybe.

Spiritual weapon:

you can make a melee spell attack

Certainly yes, the caster is making an attack

Bigby's Hand:

Make a melee spell attack for the hand using your game statistics.

This is more arguable. The hand is attacking with the caster's statistics. A DM will have to decide whether Bless is part of that.