It's possible you can claim them, but unlikely, if the husband has income. It's complicated.
You can't claim them if they did not live with you for more than half the year (that's an over simplification of the rule, but that's usually the outcome)
You can not claim them if she had more than $4050 of income on her own. If she lives in a community property state, some of her spouse's income counts as hers.
You can't claim her if she files a joint return with her spouse. This effectively means the husband has to agree to file as Married filing separately, to let you claim her.
You cannot claim the kids if they lived with their father, for more than half the year, and he is required to file a tax return.
