Final answer:
Lisa can claim two dependents on her tax return: her current husband and her stepson. Her ex-husband and former mother-in-law do not qualify as dependents.
Step-by-step explanation:
Looking at the support Lisa provided in 2020, we can determine who may qualify as her dependent for tax purposes. Let's consider each individual Lisa supported.
Her current husband: Yes, because he has no income and is not claimed as a dependent by someone else.
Her ex-husband: No, as he does not live with her and is not related to her by marriage anymore.
Her former mother-in-law: No, as she does not live with Lisa and the relationship was through a marriage that has ended.
Taking these points into account, Lisa can claim two dependents on a separate return, provided all other dependency tests are met.