It looks like a plant we used to call English dogwood, but the scientific name is philadelphus coronarious. My grandmother had one in her yard when I was a child.
Sherry

Here is a link that might be useful: English Dogwood

Oops, when I saw the second picture, I thought it was tree no. 2 - the actual tree no. 2 does look like a crabapple of some sort.
Sherry

They're both crabapples. Not dogwood (Cornus) not mock-orange (Philadelphus).

Resin

But what crabapple family are those white-pinkish? I found out just recently that I bought the wrong crabapple. The nursery told me that Prairie Fire has white to pink flowers. However, images.google.com is showing a lot of red flowers only.

The nursery was wrong, Prairiefire has strongly red/purple flowers, and the new leaves come in reddish and then green up over the summer.

I've seen malus sargentii look a lot like that. They start out with red buds and then the flowers go white.

Consisting of basal sprouts these could both be rootstock seedlings. The top one might resemble Malus baccata if examined with an eye for pertinent technical details. Some cultivars are selections of pure species and others are hybrids involving more than one kind. Hundreds of cultivars have been introduced in North America.

Thanks folks! I saw a website 2 weeks ago which has tons of crabapple pictures. I should have bookmarked it. That's where I learned about malus. They are really nice. I'm glad that I didn't put the Prairie Fire in front of our house. My wife and I have a new love and that is Redbud! :)