I've joined a start-up as third co-founder and agreed to only 10% equity, regretted it few years in. From now on I'd not accept any offer that's not equal split between funders (few % difference at most)
For your situation if they'd be more engaged I'd suggest equal equity split what you describe sounds like normal investment albeit with fairly hands on investor. They should be getting 20%, 30% if you feel generous.
For your situation if they'd be more engaged I'd suggest equal equity split what you describe sounds like normal investment albeit with fairly hands on investor. They should be getting 20%, 30% if you feel generous.