I would say yes. We had the same problem with Kimberley and it's only been the last 2 months that she has gone to bed with no trouble at all. DH used to have to sit in her room until she went to sleep and some nights it would be him asleep before her. I found she is much better since she stopped her daytime sleep.

Does Jacob still have a sleep during the day?

What is your bedtiem rountine ?
Maybe change it in some way.
If Kimberley fights us at bedtime DH reads to her in bed and within 10mins of her staying still she is asleep.

They are always good for someone esle. They will eat better, behave and sleep better.

Good luck and i hope something works for you soon.