Hi Don't want to be a damper on things but as you have 2 kids and I assume you will have to find work at some stage, I think you need to think things through very carefully and do loads of research. Unfortunately, I have seen a fair few people come and go, because they haven't thought things through properly and ended up scratching around to try to make a living, not having enough to get by and having to return. Not a nice situation to be in, especially after having uprooted the whole family. My advice would be to rent for at least a year to see whether you really like it here and to experience the climate all year round. The weather can range from blisteringly hot to downright cold and damp. As obvious as it may seem, living in another country is far different from a 2 week holiday. You say you will have a fair bit of money to bring with you, which is good. I think you should have a safety net of at least a year's survival money behind you. Start learning Portuguese now, if you don't already speak the language and keep learning every day. The grass always looks greener, as they say, so whilst Portugal may statistically have less crime and seem a nicer environment, it can be a little dull if you need a lot of entertainment and stimulation and the way of life can take some getting use to. Not sure about the education system, as I don't have kids, but I have heard that the quality of Portuguese education isn't as good as the UK and Germany etc. However, they would at least learn another language and have the experience of living in another country, which is an education in itself. I am sure others can advise better on this. Anyhow, good luck with your decision and make sure if you do decide to stay and buy a house etc to read mine and others tips on buying property.
Thanks
Zackery