This is more looking for advice rather than ranting. I would like to hear what other people think of this before I have this conversation with my DP so Im not being unreasonable. 
DP and I have a very happy relationship. I have three kids that live with me apart from access with their Dad. He lives with us in the same house (not their Dad...DP haha).
I have a minimal income plus maintenance for my kids. That's all grand. DP has completed his degree as a mature student but now has a job which pays peanuts but is in that field (I do mean peanuts). We all have to start somewhere, which I totally understand.
He commutes a total of 4 hours per day just to get to and from this job and it costs a fortune in petrol. Petrol eats up the vast majority of his pay, but hes truly dedicated to getting a career which will, in the end pay a lot more. He also has children and pays maintenance for them.
I needed to get control of my finances and start saving towards summer camps etc so have worked everything out and I am paying out £200 per week on all bills, rent, food etc. I know Im blessed in this market to have rent so cheap and I'm not complaining about that! DP puts £43 towards this each week.
Im converting euros to pounds here, so apologies.
My question is, am I being unreasonable for asking him to contribute more towards the household?
I appreciate that my kids are not his, and that there is no reason he should be obligated to support them. At the same time, I feel if you live as a family, then bills should be split. We have Netflix and Amazon but those were my choices and so I wouldnt ask him to shoulder that bill (those are not included in the 200).
I feel so mean because I know he is trying his best and gets paid rubbish money atm, but (maybe selfishly) I cant think of anyone who gets their rent, utilities, food, bins, washing, tv, broadband etc for fifty euros a week.
I feel like such a cow for posting this, but I cant support everyone with the money I have. We have a lovely relationship, I love his kids and he dotes on mine. I dont want to have this conversation with him but I am going to have to.
I would genuinely appreciate hearing what people think would be a fair amount to ask him for.