What you have is just family living in your second home and helping with expenses ... you do NOT have a rental so do NOT enter this on your tax return.
As to what you can deduct ... the same as you did before but with the new itemized deduction laws.
See this TurboTax support
FAQ for how tax reform will affect your 2018 tax return - https://ttlc.intuit.com/questions/4482394-how-will-tax-reform-affect-my-2018-federal-tax-return
