Visitor Visa - B2

I have decided to visit the US as a tourist next summer. I've asked this from different people they said i don't need to be employed to get US visa, but i am still not satisfied, thus i would like to be really sure before i apply for the visa. I have children here in europe Ireland, i will be getting married to mother of my children in a month's time. I am currently unemployed, but i am a 'Family Carer' because i have kids with disability so the government is paying me for caring for my kids with disability, and so i am not allowed to work full time. My partner is also a Family Carer as we are caring for our kids together, so same applies to her. Also i just finished a part time course and hoping to start another course part time. I have residency right here, my children were born here, my partner has residency here too, so we all reside here legally. I have been to England twice as a tourist and i have proof copy of my previous visas. My late dad was a US green card holder, my dad's second wife is currently US green card holder along with her 4 children, but i have no idea where they live in US, we don't communicate for years. Will i still declare i have relative in US? I'm gonna stay in a hotel during my visit in US so i will not visit any relative. Do i stand any chance of getting US B2 visa to travel as a tourist? I have bank statement that can show proof of all my income support from the government for both weekly and monthly payments, also from my partner. What can i work on to make my application stronger? thanks.