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Take a look at this article I wrote on rosebushes not blooming: https://www.gardeningknowhow.com/ornamental/flowers/roses/no-blooms-on-roses.htm

Also, I grew Lagerfeld myself a few years ago. I found it to be a very stingy bloomer. Loved the color of the blooms and the fragrance but just too bloom stingy for my liking. I would recommend giving the rosebush a couple years though to be sure as some folks claim to get lots of nice blooms from Lagerfeld. A newly planted rosebush will not perform like an established one. It takes two to three years for them to get fully established.

It sounds like you may have some Thrips on your roses. They are very tiny and hard to see with the naked eye. They are also very hard to get rid of because they attack the buds of the roses very early and hide within the bud. They suck their nourishment from the petals of the buds and thus also prevent them from opening. I have done battle with them before and you have to keep after them due to them being deep into the buds. There are a couple courses of action to take. One is to buy some Bayer systemic rose food and treatment. Feeding the roses with this granular mix will allow a systemic insecticide to go up through the roots and into the foliage and blooms. I have used the Bayer Tree and Shrub for this and it does work well. Another method is to spray the top foliage and buds of the rosebushes with either Ortho Bug B Gon Max or Sevin for 4 to 5 spraying cycles 5 days apart.

I fully understand the Home Grown approach. There is a fungicide on the market that truly meets that thought and approach. It is a truly Earth Friendly product called Green Cure. Check it out at this website: http://www.greencure.net . I went to using this product because I did not like all the harsh fungicides on the market. Since finding it I have no more problems with Powdery Mildew, Rust or Black Spot. Apply it per the label for both Cure and Prevention. It meets the Home Grown label well. Here is an article link for you to check out as well on rust: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-rust-disease.htm

Since they are bareroot roses it is far easier. If they were growing and all full of foliage and buds it could be most difficult. With bareroot roses you can soak some shredded newspaper or just plain shredded paper, place that all around the root systems. Sprinkle water over the entire rosebush and place them in large plastic containers filled with even more shredded wet paper or wet sawdust. Do not put lids on the containers until you are ready to haul them to your brother. Keep them in the coolest place you have. Like the dark area of an air conditioned basement or even a cold crawl space. Not freezing cold but cold or very cool. Keep an eye on the water content in the shredded material or sawdust. Keep the rosebushes covered with it as well. Keeping them nicely damp and cool while in storage is the key.

You can certainly give it a try but I have not heard that it works with roses. Here is an article for you on Blue & Black roses: https://www.gardeningknowhow.com/ornamental/flowers/roses/black-roses-blue-roses.htm