The first quote is from this tweet by Trump from the 11th of January 2017:
Russia has never tried to use leverage over me. I HAVE NOTHING TO DO WITH RUSSIA - NO DEALS, NO LOANS, NO NOTHING!
The source of the second quote is this eturbonews.com article from 2008 about remarks from Trump Jr. at the Cityscape USA Bridges U.S. and Emerging Real Estate Markets Conference:
“And in terms of high-end product influx into the US, Russians make up a pretty disproportionate cross-section of a lot of our assets; say in Dubai, and certainly with our project in SoHo and anywhere in New York. We see a lot of money pouring in from Russia. There’s indeed a lot of money coming for new-builds and resale reflecting a trend in the Russian economy and, of course, the weak dollar versus the ruble,” he said.
I don't see a reason for them to make this up in 2008, but there does not seem to be audio recording of this, nor are there other sources from the time that reported about this. One other website reported about the conference and Trump Jr., but does not contain the quote or any other statements made by Trump Jr. regarding Russia.
The source for the third quote is James Dodson - a writer focusing on golf - in an interview with WBUR, in which he claims that Eric Trump said this in a private conversation in 2013. Eric Trump denies this. There is no way of knowing whose version of events is correct.