Today I surprised my friend (date) by going to his house since I felt like he is getting tired of me

I've known him for over a decade and we have a more or less 15 yr age difference.
We hung out for a while and when his Dad saw me, he asked to speak to me in the dining room and my friend left me with his Dad! His Dad is in his 80s and told me his whole career and some questions about me in over 1 hour. I thought he wanted to get to know me because of his son as he asked me to write my full name, mobile number and landline number. What surprised me was when he said he is a lonely man since his wife died 2 years ago. He asked me if I knew any nurse or doctor that could take care of him ( I assume yun ang gusto niya makasama as partner) He then asked me if I could keep a secret. I said yes and then he told me that if he has a wife she will get a 100k+ allowance in a year

He said he wanted 27 to 35 and then he asked my age

I don't know what to make of his statement but when his Dad excused himself then asked for my hand under the table and gave me an envelope. I placed it on top of the table and he told me don't put it there but put it in my bag. He also asked me if we could have lunch at intercon on Saturday (giba na yun diba). I said I am going out with his son on Sunday and he could see me then. He had other statements pa that felt awkward but the Dad was super nice and even split all of his food with me. He was very attentive about how full my glass is (his son is his opposite, walang paki).
Anyway, I checked the envelope when I got home and it had cash on it. WTF??? It's not a big amount but it's easy money for 1 hr of listening. hahaha! Now I don't know if I should tell my friend because I don't want to embarrass him of his Dad's actions (although he is aware naghahanap ng babae and he already told me his Dad is embarrassing ) He also told me I should not have worn a vneck top because his Dad will see it

BUT I don't think he had any idea that his Dad would hit on me. WTF. Should I tell him or what? I also decided that I don't want to see him again, we were together half a day and he was so tired na
Early sign kaya ng Alzheimer's yun how the Dad acted?