_Andréi Ivánovich KOBÝLA _
                                                        | (.... - 1351)               
                             _Fedor Andreevich KOBYLIN _|
                            | (.... - 1407)             |
                            |                           |_____________________________
                            |                                                         
 _Ivan Fyodorovich KOSHKIN _|
| (.... - 1427)             |
|                           |                            _____________________________
|                           |                           |                             
|                           |___________________________|
|                                                       |
|                                                       |_____________________________
|                                                                                     
|
|--Zakhary Ivanovich KOSHKIN 
|  (.... - 1461)
|                                                        _____________________________
|                                                       |                             
|                            ___________________________|
|                           |                           |
|                           |                           |_____________________________
|                           |                                                         
|___________________________|
                            |
                            |                            _____________________________
                            |                           |                             
                            |___________________________|
                                                        |
                                                        |_____________________________