is 1200 enough? for kids clothes andfood and education etc?
1200 a week? yes.
1200 a month? no, definitely not, even with a very modest lifestyle. Not with two kids.
You say you can live rent-free but there are utilities. Then petrol, car insurance, things for school, medication if any of the kids get sick, food and clothing, lots of things. I'd say 3000 a month is the lower limit for modest living. 2000 for absolutely bare necessities.