limitation

Assalam AlaikomI am working as a manager for an Islamic organisation in London and I’ve received this question: “I am 85 years old and I have 3 sons and 1 daughter. I own two houses evaluated to £.500.000 each, and cash amount of £.500.000. I want to donate the two houses to an Islamic charity and leave the cash money for my children. Can I do that? If no, what the limitation I can spend of my wealth for charity?” What is the Fatwa Jazakom Allah Khayran?

Respected scholars, as-salamu `alaykum. I'm a manager of an Islamic organization in London. I received this question: "I'm an 85-years-old woman and I've three sons and one daughter. I own two houses - each worth £500,000 - and also £500,000 in cash. I want to donate the two houses to an Islamic charity and leave the cash money for my children. Can I do that? If I can't, then what's the limitation I should abide by when spending of my wealth for charity?" Jazakum Allahu khayran.