Based on the summary, is it similar to our study of the provisions of contracts and related matters? If so, cite the related articles and explain. PLEASE APPLY PHILIPPINE LAWS (Articles).

5. httpsWyoutu.beMKiZF'ttEDAk Promises and reliance in contract law a. Summary- There was a brother-in-law who learned that his sister's brother has died. The sister is somehow living an uncomfortable life with her two children. The brother felt generous and said that if the sister sells her dump house, she can live at his extra house for free. And so, she did sell it at a loss. The sister moved to the said house with her children. However, after a year, the brother-in-law ordered that they move out of the house and transfer to a place less desirable, after which he threw them out of there too. Can she sue him? b. l