fallout shelter if i build a level 1 next to a level 3 will they merge when i upgrade

The dweller will invite the survivor to the Vault.

Sometimes when exploring this discovered location, dwellers will meet survivors. Once the Overseer's office is built, dwellers exploring the wasteland can discover locations.Obtaining a Legendary dweller or rare Vault dweller from a lunchbox.Enticing a wanderer with the radio broadcasts from the radio studio.A couple of max level (50) dwellers with max stats (10) can produce legendary children starting with 40 randomly assigned SPECIAL points.Uncles, cousins and nieces can mate, as can aunts and nephews.One will see the 'Hanging out with the family' message when they meet in the living rooms. Dwellers sharing a parent cannot mate, nor can they mate their own parent or grandparent.One can change the child's name as they would change anyone other dweller's name, by clicking on the name at the top of their Statistics and editing it. If the child is a boy they take their mother's surname and if a girl then their father's surname. The surname of the child is, by default, determined by their sex.Placing more than one couple in a suitably sized room may result in mixing and matching of the couples as they decide which is their best mate. Living rooms follow the same space rules as other rooms - a single room can hold 2 adults, a double holds 4, and a triple holds 6.If couples have been in the same room for a while (but talking or dancing with other dwellers), they may have missed a step. The procedure that a couple will follow is: Meet, talk, dance, mate.Related Vault dwellers cannot mate (with the below exceptions). Mating an adult male and an adult female dweller in the living rooms, as detailed below.Players can acquire new Vault dwellers by: Players begin with 12 Vault dwellers, all of which start at Level 1.

Fallout shelter if i build a level 1 next to a level 3 will they merge when i upgrade