Do you use the past tense in a subordinate clause in past subjunctive?

Question

• I wish I had a robot which helps me do my homework.
• I wish I had a robot which helped me do my homework.

Which sentence makes more sense? Does the tense in the subordinate clause need to agree with the tense of the main clause?

Answer 1

Yes. The verb "help" is part of the "wish", so it too must be shifted to the past. Your second sentence is correct

Answer 2

Attributive clauses don't require usage of sequence of tenses so the first one is correct in my opinion