Two steps on the diagram, none in real life
Two identical bicycles at different sizes, tangled into one shape, because how close two cousins actually were had nothing to do with the family chart.

Two bicycles, the same design twice. Same frame, same handlebars, same basket. One is drawn a size larger than the other, and they aren't set side by side — the wheels overlap, the frames cross, until the two machines read as a single tangled shape.
The family chart puts him two branches away. Every actual summer put him at zero.
Why draw two bicycles instead of two people?
Because the closeness lived in what they did together, not in what either of them looked like.
A portrait of two children says who they were. It says nothing about the bikes left in the same hedge, ridden to the same shop, crashed on the same corner. The object is the evidence — leaving the faces out is what keeps the design about a relationship rather than about two specific children a stranger has never met, which is closer to what a sibling gets on a shirt than what a distant cousin usually does.
Why does the size difference matter?
It's the only thing in the image that admits time passed.
Two identical bikes at one size would just be a matching pair — the kind of set-up twins wear on purpose. The gap between the two sizes here says the opposite: two children a couple of years apart, riding the same route at the same age, a few summers out of step with each other. Remove the difference and the shirt stops being about a childhood and starts being about a product.
Why are the frames overlapping instead of parked side by side?
Because side by side is what a family tree already draws, and it draws the wrong thing.
A tree puts a cousin one branch over — near, but visibly on a separate line. Tangling the bikes into one shape says the opposite: no clean branch, no visible gap, one continuous set of summers that happened to involve two children with different surnames. The tangle carries the whole argument; two bikes parked neatly apart would be a tidier, much weaker shirt.
Do I need his permission to put this on a shirt?
Nobody owns the memory of a shared bicycle, so there's no licence to clear — but the real question isn't a legal one.
He might love seeing it. He might not want a childhood he's since drifted from turned into something a stranger can see. The honest move is the same one that applies to any relative who ends up on a chest: ask him, plainly, before it's made rather than after. Nobody else can answer that question for you.
Does this work for a cousin I only saw on holidays?
Not this exact design — the tangle only works where there was a real, everyday closeness to tangle.
A holiday cousin has a real relationship, just a different shape: parallel rather than overlapping. The same logic that can make someone with no blood tie into an uncle by decision runs the other way too — a blood cousin can end up on the far side of a closeness the label never predicted. This design is for the opposite case, where the surname difference stopped being the relevant fact.
What if the closeness didn't last?
The design still works, and arguably means more.
Plenty of people were exactly this close to a cousin at nine and see him twice a decade now. The shirt isn't a claim about the present tense — it's a record of a period that happened, closer to a bicycle's own number plate than to a portrait of a current friendship. A label can outlive the closeness it was describing; that isn't a reason to drop the label.
Does it print well?
Yes — two flat cream shapes on a mid-tone garment print cleanly, provided the overlap stays legible.
The crossing point is the risk: where the frames and wheels overlap, the two shapes need a clear edge or the tangle reads as a smudge instead of two bicycles. One ink, kept flat with no gradient in the cream, holds that edge on olive, rust or a dark bottle green.
How do I get one made?
Describe the two objects at JustOG — what they were, how their sizes differed, and whether they overlap or sit apart. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
One bike a size bigger than the other, and no clean line where one frame ends and the next begins.