I'm the tech lead on a startup and I have co-founders who know essentially zero about tech or web businesses. Our CEO sold real estate before this. We are a SAAS for students and companies that connects them for jobs via our website. I'm the CTO and have worked extremely hard for this company for 6+ months, 80-100/week, and am still having to address concerns about being "all in" as a co-founder.
My commute is roughly 2 hours and I have a young child at home and am much more productive coding when we aren't all together. I seriously think they think I work 10 hours a week when in fact I work 100. I'm happy to attend however many meetings they want to have. Ironically, I've been the one to suggest 2/3 of the weekly meetings we do have. How can I convince them short of sitting right next to them in the office from 9-5 every day that I'm actually delivering a lot of value to the company?
Salient details: We don't have much funding, less than 100K, and I'm a very experienced engineer, so its highly unlikely I can be replaced in a reasonable amount of time. We have had listings for $40K salary/2-3% equity for both developers and designers on many sites for months with no takers. Before I arrived, another developer cost them ~$50K and took 4 months to build a website which was unusable according to their standards and generated no sales. I built our website in 2 months and this has lead to $40K in sales and the expectation to hit 6 figures imminently.
You are not being treated and trusted as a co-founder, you're being treated and trusted as a hired CTO. You can choose to accept this, or not.
If you're going to accept it, you have to be the one to close the gap. In situation like this, you have to make the time to show plans that demonstrate what you're doing, and the time required for each. It doesn't need to be a fancy planning tool - just a Google sheet listing the item, the estimated work effort, the deadline, and any dependencies. The blocks of time should be less than 40 hours each - even below 8 if you can get them there. Then be fully transparent about your progress. When new work gets added, ask what drops. If you have ad-hoc support tasks, add them to the log. This may add 30 minutes to each day, but it will save you more than than in aggravation.
If you choose not to accept it, the market is still good for solid engineers. You can find a job that pays more and allows you to see your kid. (Are you crazy working 100 hours when you have a baby? The divorce will take away all your equity! And besides, you'll have to work more on-site if this thing actually grows.)