Half-brother:
Half-brother is a brother with whom one has only one parent in common.
Step brother:
Step brother is the son of the one’s stepmother or step mother by a union with someone other than one’s father or mother respectively.
Differences:
| Basis | Half-brother | Step-brother |
|---|---|---|
| Definition (www.oxforddictionaries.com) | A brother with whom one has only one parent in common. | A son of one’s step-parent by a marriage other than with one’s own father or mother. |
| Synonyms | Folk, uncle, niece, mother and cousin | |
| Marriage | Half-brother cannot marry his half-sister. | Step siblings can marry. |
| Pronunciation |
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| Related | They are biologically related. | They are not biologically related. |
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