# ps aux | grep apache
root     13955  0.0  0.0   3108  1304 pts/1    S+   04:58   0:00 grep apache
root     14144  0.0  0.6  29016 13280 ?        Ss   Jul01   0:01 /usr/sbin/apache2 -k start
www-data 14149  0.0  0.4  29580  9028 ?        S    Jul01   0:07 /usr/sbin/apache2 -k start
www-data 14150  0.0  0.4  29656  8904 ?        S    Jul01   0:10 /usr/sbin/apache2 -k start
www-data 14151  0.0  0.4  29560  8840 ?        S    Jul01   0:06 /usr/sbin/apache2 -k start
www-data 14152  0.0  0.4  29656  8768 ?        S    Jul01   0:06 /usr/sbin/apache2 -k start
www-data 14153  0.0  0.4  29664  8748 ?        S    Jul01   0:04 /usr/sbin/apache2 -k start
www-data 14154  0.0  0.4  29656  8744 ?        S    Jul01   0:05 /usr/sbin/apache2 -k start
www-data 14156  0.0  0.4  29656  8648 ?        S    Jul01   0:04 /usr/sbin/apache2 -k start
www-data 14158  0.0  0.4  29656  8684 ?        S    Jul01   0:05 /usr/sbin/apache2 -k start
www-data 14159  0.0  0.4  29656  8756 ?        S    Jul01   0:08 /usr/sbin/apache2 -k start
www-data 14160  0.0  0.4  29656  8744 ?        S    Jul01   0:06 /usr/sbin/apache2 -k start

# cat /proc/14150/stat
14150 (apache2) S 14144 14144 14144 0 -1 8512 64133 632 0 0 870 157 0 0 20 0 1 0 7094774 30367744 2226 4294967295 1 1 0 0 0 0 0 536875008 201344619 0 0 0 17 0 0 0 0 0 0

3° is parent