Pelvic girdle pain (abbreviated PGP) can be described as a pregnancy discomfort for some women and a severe disability for others. PGP can cause pain, instability and limitation of mobility and functioning in any of the three pelvic joints. PGP has a long history of recognition, mentioned by Hippocrates and later described in medical literature by Snelling. The affection appears to consist of relaxation of the pelvic articulations, becoming apparent suddenly after parturition or gradually during pregnancy and permitting a degree of mobility of the pelvic bones which effectively hinders locomotion and gives rise to the most peculiar and alarming sensations. Classification
Prior to the 20th century, specialists of pregnancy-related PGP used varying terminologies. It is now referred to as Pregnancy Related Pelvic Girdle Pain that may incorporate the following conditions:

Diastasis of the symphysis pubis (DSP)
Symphysis pubis dysfunction (SPD)
Pelvic Joint Syndrome
Physiological Pelvic Girdle Relaxation
Symptom Giving Pelvic Girdle Relaxation
Posterior Pelvic Pain
Pelvic Arthropathy
Inferior Pubic Shear/ Superior Pubic Shear /Symphyseal Shear
Symphysiolysis
Osteitis pubis (usually postpartum)
Sacroiliitis
One-sided Sacroiliac Syndrome /Double Sided Sacroiliac Syndrome
Hypermobility"The classification between hormonal and mechanical pelvic girdle instability is no longer used. For treatment and/or prognosis it makes no difference whether the complaints started during pregnancy or after childbirth." Mens (2005)

Signs and symptoms
A combination of postural changes, baby, unstable pelvic joints under the influence of pregnancy hormones, and changes in the centre of gravity can all add to the varying degrees of pain or discomfort.
A stepfather or stepdad is a non-biological male parent married to ones preexisting parent. A stepfather-in-law is a stepfather of ones spouse. Children from his spouses previous unions are known as his stepchildren. Culture
Though less common in literature than stereotypical evil stepmothers, there are also cases of evil stepfathers, such as in the fairy tales The Gold-Bearded Man (in a plot usually featuring a cruel father) and The Little Bull-Calf. One type of such tale features a defeated villain who insists on marrying the heros mother and makes her help him trick the hero and so defeat him. Such tales include The Prince and the Princess in the Forest and The Blue Belt, although the tales of this type can also feature a different female relation, such as the stepsister in The Three Princes and their Beasts. In fiction, evil stepfathers include Claudius in Hamlet (though his role as uncle is more emphasized), Walter Parks Thatcher in Citizen Kane (though this is debatable), Murdstone in Charles Dickenss David Copperfield, the King from the movie Radio Flyer, and Gozaburo Kaiba (who adopted Seto and Mokuba Kaiba) from Yu-Gi-Oh!. The Stepfather  also depict an evil father who has murdered his family and subsequent families. The film Sucker Punch features a sexually abusive stepfather.In his opera La Cenerentola, Gioacchino Rossini inverted the tale of Cinderella to have her oppressed by her stepfather. His motive is made explicit, in that providing a dowry to Cenerentola would cut into what he can give to his own daughters.