| Relation | Father | Brother 1 | Brother 2 | Brother 3 |
| Gender M/F | M | M | M | M |
| Age at the first diagnosis (years) | 31 | 25 | 24 | 14 |
| BMI (kg/m2) | 21 | 18 | 20 | 19 |
| Fasting plasma glucose (mg/dl) | 129 | 128 | 132 | 131 |
| HbA1c (mmol/mol) | 47 | 45 | 50 | 48 |
| C-peptide (ng/dl) | 2.2 | 1.8 | 1.7 | 2.1 |
| HOMA-IR | Normal | Normal | Normal | Normal |
| Glycosuria (mg/dl) | Absent | Absent | Absent | Absent |
| Ketonuria (md/dl) | Absent | Absent | Absent |
|
| Anti-beta cells antibodies (GAD, ICA, IAA) | Absent | Absent | Absent | Absent |